General Description
The MAX4383 evaluation kit (EV kit) demonstrates the
capability of the high-speed MAX4383 op amp config-
ured in a 5-pole, lowpass, multiple feedback (Rauch)
filter that provides a Butterworth response with a band-
width of -3dB at 30MHz (typ). This circuit can be used
for video anti-aliasing and reconstruction filtering for
HDTV, Progressive DVD, and XGA resolution graphics
displays. The MAX4383 EV kit is designed to drive a
75
back-terminated load, common in video applica-
tions, with an overall gain of 1. The MAX4383 EV kit is a
fully assembled and tested surface-mount board that
operates from either a +5V single supply or
5V dual
supplies.
Features
o Video Filter Solution for ATSC and High-
Resolution Graphics Applications
o 5-Pole Active Multiple Feedback (Rauch) Video Filter
o 30MHz Bandwidth at -3dB (typ)
o >40dB Attenuation at 74.25MHz
o +5V Single-Supply or 5V Dual-Supply Operation
o Surface-Mount Construction
o Fully Assembled and Tested
o Eliminates Costly Inductors with More Accurate
R-C Components
Evaluates: MAX4383
MAX4383 Evaluation Kit
________________________________________________________________ Maxim Integrated Products
1
19-2792; Rev 0; 3/03
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
Ordering Information
Simplified Circuit
Typical Application Circuit
PART
TEMP RANGE
IC PACKAGE
MAX4383EVKIT
0C to +70C
14 TSSOP
LOWPASS FILTER
G = 2V/V
DISPLAY
Z
O
= 75
DAC
R16
DAC
LOAD
R15
MPEG ENCODER
MAX4383 EV Kit
DOES
VIDEO
U1C
U1B
U1D
U1A
R14
INPUT
OUTPUT
R1
R3
R5
R6
R15
C1
C4
R13
R12
R2
R7
R11
R9
R10
R16
R4
C6
C2
C3
C5
R8
V
EE
V
CC
V
EE
V
CC
V
EE
V
CC
V
EE
V
CC
Evaluates: MAX4383
MAX4383 Evaluation Kit
2
_______________________________________________________________________________________
Quick Start
Required equipment:
Dual 5.0V DC power supply
Signal generation platform (e.g., Tektronix TG 2000)
Video measurement set (e.g., Tektronix VM 700A)
The MAX4383 EV kit is a fully assembled and tested
surface-mount board. Follow the steps below for board
operation. Do not turn on the power supply until all
connections are completed.
Procedures
1) Connect the output from the 75
video signal gener-
ator to the INPUT BNC connector on the EV kit.
2) Connect the input of the 75
video measurement set
to the OUTPUT BNC connector on the EV kit.
3) Connect the +5.0V supply to the VCC pad. Connect
ground to the GND pad.
4) Connect the -5.0V supply to the VEE pad. For single-
supply (+5.0V) operation, connect VEE to ground
and bias the input appropriately.
5) Set the signal generator for multiburst sweep.
6) Turn on the
5.0V DC power supply.
7) Analyze the filtered output signal with the VM700
video measurement set.
Note: The generator (signal source) and the video test
set (load) must be 75
terminated, and the signal
source must also provide a DC return to ground. This is
the function of R16 and R15, respectively. These resis-
tors are set to 75W in the MAX4383 EV kit. If a 50
sys-
tem is used, R16 must be changed to 50
. If a 50
analyzer is used, R15 must be 50
. The DAC must sup-
ply a DC voltage to bias the input of the MAX4383. If
your DAC has insufficient bias to do this, add a 5.6k
resistor between VCC and the junction of R16 and R14.
Component Suppliers
SUPPLIER
PHONE
FAX
WEBSITE
Murata
770-436-1300
770-436-3030
www.murata.com
Taiyo Yuden
800-348-2496
847-925-0899
www.t-yuden.com
TDK
847-803-6100
847-390-4405
www.component.tdk.com
Component List
DESIGNATION
QTY
DESCRIPTION
C1, C4
2
3.3pF 0.25pF, 50V C0G ceramic
capacitors (0603)
TDK C1608C0G1H3R3CT
C2
1
68pF 5%, 50V C0G ceramic
capacitor (0603)
Murata GRM1885C1H680J or
TDK C1608C0G1H680JT
C3
1
27pF 5%, 50V C0G ceramic
capacitor (0603)
Murata GRM1885C1H270J or
TDK C1608C0G1H270JT
C5
1
33pF 5%, 50V C0G ceramic
capacitor (0603)
Taiyo Yuden UMK107CG330JZ or
TDK C1608C0G1H330JT
C6
1
100pF 5%, 50V C0G ceramic
capacitor (0603)
Murata GRM1885C1H101J
TDK C1608C0G1H101JT
C7, C9
2
10F 20%, 6.3V X5R ceramic
capacitors (0805)
Taiyo Yuden JMK212BJ106MG or
TDK C2012X5R0J106M
C8, C10
2
0.1F 10%, 25V X7R ceramic
capacitors (0603)
TDK C1608X7R1E104K
R1, R2, R4, R5,
R7R13
11
210
1% resistors (0805)
R3
1
100
1% resistor (0805)
R6
1
121
1% resistor (0805)
R14, R15, R16
3
75
1% resistors (0805)
R17
0
Not installed, resistor (0805)
U1
1
MAX4383EUD (14-pin TSSOP)
INPUT, OUTPUT
2
BNC connectors
None
1
MAX4383 PC board
Please indicate that you are using the MAX4383 when contacting these suppliers.
Evaluates: MAX4383
MAX4383 Evaluation Kit
_______________________________________________________________________________________
3
Detailed Description
The MAX4383 EV kit is a fully assembled and tested
surface-mount circuit board that demonstrates the
capability of the high-speed MAX4383 op amp config-
ured in a 5-pole, active lowpass multiple feedback filter
circuit. The filter can be used for video anti-aliasing or
as a reconstruction filter for ATSC (HDTV) or high-reso-
lution (XGA) graphics. The circuit has a 75
DAC load
(R16), a gain of 2V/V, and a 75
source (R15) for dri-
ving a 75
back-terminated load to an overall gain of 1.
The board operates from either a +5V single supply or
5V dual supplies.
The MAX4383 EV kit demonstrates a lower cost, but
more accurate way to design video filters. Using R-C,
rather than L-C components, it provides a 30MHz, -3dB
bandwidth with >40dB rejection at 74.25MHz (Figure 1),
as well as group-delay compensation and buffering
using a single MAX4383 quad op amp. The improved
tolerance of R-C, versus L-C components, removes the
need for production tuning. Some initial tuning may be
required to account for the variation in the DAC load
and parasitic components due to PC board layout differ-
ences. The MAX4383 EV kit uses dual supplies, but the
MAX4383 can be run from a single supply.
The MAX4383 EV kit is a Rauch, or multiple feedback
realization of a 5-pole modified Legendre characteristic
using one 1st-order +6dB gain stage and two 2nd-order
unity-gain stages. The final stage is a 1st-order group
delay compensator, which drives the back-terminated
75
load to an overall unity gain. There are three sensi-
tive points in the circuit; R14, which controls the real
pole, C1 and C4, that control the high-frequency poles,
and C5 that sets the group delay compensation.
The MAX4383 EV kit comes with a 75
termination (R16)
and a BNC connector (INPUT) in place of the DAC nor-
mally found at the input for measurement purposes, and
this reduces the gain to -6dB overall. The values of R14
and R16 are based on the DAC with a typical load resis-
tance of 25
to 35. To accommodate different load
resistors, adjust the value of the R14 and the C6 product
accordingly. The values of C1 and C4 reflect a two-sided
PC board with minimal ground plane around the op
amps pins. C5 adjusts the group delay compensation.
Adjust the value of C1 and C4 for bandwidth before
adjusting C5 for group-delay variation compensation.
5
1
10
100
GAIN vs. FREQUENCY
MAX4383EV fig01
FREQUENCY (MHz)
GAIN (dB)
-45
-35
-25
-15
-5
-10
-20
-30
-40
0
Figure 1. Gain vs. Frequency Response of the EV Kit Filter
Evaluates: MAX4383
MAX4383 Evaluation Kit
4
_______________________________________________________________________________________
MAX4383
U1
INA+
3
2
1
6
5
7
V
CC
V
EE
VCC
GND
C7
10
F
C8
0.1
F
C10
0.1
F
C9
10
F
R15
75
OUTPUT
VEE
OUTD
IND-
11
14
12
8
10
9
13
BNC
R17
OPEN
R11
210
C6
100pF
R14
75
INPUT
BNC
R13
210
R3
100
R16
75
C1
3.3pF
R5
210
R4
210
C2
68pF
R12
210
R1
210
R2
210
C5
33pF
R8
210
R10
210
C4
3.3pF
R6
121
R9
210
R7
210
C3
27pF
4
IND+
OUTC
INC+
INC-
INA-
OUTA
INB-
INB+
OUTB
ALL RESISTORS ARE
1%.
Figure 2. MAX4383 EV Kit Schematic
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 5
2003 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
Evaluates: MAX4383
MAX4383 Evaluation Kit
Evaluates: MAX4383
Figure 3. MAX4383 EV Kit Component Placement Guide--
Component Side
Figure 4. MAX4383 EV Kit PC Board Layout--Component Side
Figure 5. MAX4383 EV Kit PC Board Layout--Solder Side
Figure 6. MAX4383 EV Kit Component Placement Guide--
Solder Side
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